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Commitments and Contingencies - Additional Information (Detail) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 17, 2018 USD ($) ft² | Sep. 07, 2016 USD ($) | Feb. 28, 2018 USD ($) | Nov. 30, 2009 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Rent expense |  |  |  |  |  |  | $ 800,000 | $ 700,000 | $ 2,200,000 | $ 1,700,000
Deferred rent |  |  |  |  |  |  | $ 1,100,000 | $ 600,000 | $ 1,100,000 | $ 600,000
Maximum borrowing capacity |  |  | $ 175,000,000 |  |  |  |  |  |  |
Principal amount including interest paid in kind |  |  | $ 101,200,000 |  |  |  |  |  |  |
Debt maturity date |  |  | Dec. 31, 2023 |  |  |  |  |  |  |
Litigation settlement agreement date |  |  |  |  |  |  |  |  | September 7, 2016 |
Symphony Dynamo Holdings LLC |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
License arrangement contingent consideration percentage |  |  |  | 50.00% |  |  |  |  |  |
License arrangement upfront payment |  |  |  | $ 50,000,000 |  |  |  |  |  |
Milestone payments |  |  |  |  |  |  |  |  | $ 0 |
Dynavax Technologies Securities Litigation |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation amount payable |  | $ 4,100,000 |  |  |  |  |  |  |  |
Sublicense Agreement | Merck, Sharp & Dohme Corp. |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Payment upon obligation |  |  | $ 7,000,000 |  |  |  |  |  |  |
Scenario, Forecast | Sublicense Agreement | Merck, Sharp & Dohme Corp. |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Payment upon obligation |  |  |  |  | $ 7,000,000 | $ 7,000,000 |  |  |  |
Office and Laboratory Space | Emeryville, California (Premises) |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Lease area | ft² | 75,662 |  |  |  |  |  |  |  |  |
Base rent per square feet | $ 4.75 |  |  |  |  |  |  |  |  |
Operations commencement date | Apr. 01, 2019 |  |  |  |  |  |  |  |  |
Initial lease term | 12 years |  |  |  |  |  |  |  |  |
Lease option to extend | The Lease has an initial term of 12 years, following the Commencement Date with an option to extend the lease for two successive five-year terms |  |  |  |  |  |  |  |  |
Renewal term of lease | 5 years |  |  |  |  |  |  |  |  |
Office and Laboratory Space | Emeryville, California (Premises) | Maximum |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Tenant improvement allowance | $ 8,300,000 |  |  |  |  |  |  |  |  |

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